#include <iostream>
using namespace std;

int main()
{
  int a,b;
  char c;
  cin >> a >> b >> c;
  switch(c)
  {
  	case '+':
  		cout<<a+b<<endl;
  		break;
  	case '-':
  		cout << a-b <<endl;
  		break;
  	case '*':
  		cout << a*b << endl;
  		break;
  	case '/':
  		if(b == 0)
  		{
  			cout <<"Divided by zero!"<<endl;
  			break;
		  }
  		cout << a/b<< endl;
  		break;
  	default :
  		cout << "Invalid operator!" << endl;
  		break;
  }
   		
}

